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Exposure Research

Records 1 to 50 of 50
2012
Kikandi, S. N., V. A. Okello, Q. Wang, O. A. Sakik, K. E. VARNER, AND S. A. Burns. Size-exclusive Nanosensor for Quantitative Analysis of Fullerene C60: A Concept Paper. ENVIRONMENTAL SCIENCE AND TECHNOLOGY. John Wiley & Sons, Ltd., Indianapolis, IN, 45:5294-5300, (2012).
2010
MOMPLAISIR, G., C. G. ROSAL, E. M. HEITHMAR, K. E. VARNER, L. A. RIDDICK, D. F. BRADFORD, AND N. G. TALLENT-HALSELL. Development of a Solid Phase Extraction Method for Agricultural Pesticides in Large-Volume Water Samples. Journal of Separation Science. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany, 81:1380-1386, (2010).
VARNER, K. E., K. Rindfusz, A. Gaglione, AND E. Viveiros. Nano Titanium Dioxide Environmental Matters: State of the Science Literature Review. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-10/089, 2010.
VARNER, K. E., S. Kikandi, AND O. Sadik. Sensors As Tools for Quantitation, Nanotoxicity and Nanomonitoring Assessment of Engineered Nanomaterials. H. Minhas (ed.), JOURNAL OF ENVIRONMENTAL MONITORING. Royal Society of Chemistry, Cambridge, Uk, 11:1782-1800, (2009).
VARNER, K. E., A. El-Badawy, D. Feldhake, AND R. Venkatapathy. State-Of-The-Science Review: Everything NanoSilver and More. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-10/084, 2010.
BRADFORD, D. F., E. M. HEITHMAR, N. G. TALLENT-HALSELL, G. MOMPLAISIR, C. G. ROSAL, K. E. VARNER, M. S. NASH, AND L. A. RIDDICK. Temporal Patterns and Sources of Atmospherically Deposited Pesticides in Alpine Lakes of the Sierra Nevada, California , USA. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 44(10):4609-4614, (2010).
2009
VARNER, K. E., S. Kikandi, AND O. Sadik. Fullerene Nanoparticle Counter Using Quartz Crystal Microbalance. Presented at 2009 EPA Nano STAR Grantee Meeting, Las Vegas, NV, November 09 - 11, 2009.
SCHUMACHER, B. A., J. H. ZIMMERMAN, C. R. SIBERT, K. E. VARNER, AND L. A. RIDDICK. Macro- and Micro-Purge Soil Gas Sampling Methods for the Collection of Contaminated Vapors. Presented at National Forum on Vapor Intrusion, Philadelphia, PA, January 12 - 13, 2009.
Kikandi, S. N., O. A. Sadik, AND K. E. VARNER. Novel Sensor for Quantitation and Cytotoxicity of Selected Nanomaterials. Presented at 237th American Chemical Society National Meeting, Salt Lake City, UT, March 22 - 26, 2009.
Kikandi, S. N., Q. C. Wang, O. A. Sadik, AND K. E. VARNER. Novel Sensor for Quantitation and Cytotoxicity of Selected Nanomaterials . Presented at 237th American Chemical Society National Meeting, Salt Lake City, UT, March 26, 2009.
Sadik, O. A., S. Kikandi, Q. Wang, AND K. E. VARNER. Novel Sensor for the Identification and Quantitation of Engineered Nanomaterials. Presented at Society of Environmental Toxicology and Chemistry, Goteborg, SWEDEN, May 31 - June 04, 2009.
Omowunmi, S. A., S. Kikandi, Q. Wang, A. Zhou, N. Du, F. Garcia, AND K. E. VARNER. Sensors as Tools for Quantitation and Cytotoxicity Studies of Engineered Nanomaterials. Presented at OECD on the Environmental Benefits of Nanotechnology: Fostering Safe Innovation - Led Growth, Paris, FRANCE, July 15 - 17, 2009.
BRADFORD, D. F., N. G. TALLENT-HALSELL, E. M. HEITHMAR, G. MOMPLAISIR, C. G. ROSAL, M. S. NASH, K. E. VARNER, AND L. A. RIDDICK. Temporal and Spatial Patterns of Airborne Contaminants Relative to Amphibian Population in Sequoia and Kings Canyon National Parks, California. Presented at Sierra Nevada - Southern Cascades Contaminants Workshop, Three Rivers, CA, April 08 - 09, 2009.
VARNER, K. E., S. Kikandi, AND O. A. Sadik. The Latest Emerging Contaminant: Nanomaterials as Personal Care Products and Their Environmental Impact. Presented at Society of Environmental Toxicology and Chemistry, New Orleans, LA, November 19 - 23, 2009.
2008
SCHUMACHER, B. A., J. H. ZIMMERMAN, C. R. SIBERT, K. E. VARNER, AND L. A. RIDDICK. MACRO- MICRO-PURGE SOIL GAS SAMPLING METHODS FOR THE COLLECTION OF CONTAMINANT VAPORS. GROUND WATER MONITORING AND REMEDIATION. National Ground Water Association, Westerville, OH, 29(1):138-143, (2009).
VARNER, K. E. SAMPLING AND ANALYSIS OF NANOMATERIALS IN THE ENVIRONMENT: A STATE-OF-THE-SCIENCE REVIEW. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-08/098 (NTIS PB2009-113239), 2008.
VARNER, K. E., B. A. SCHUMACHER, AND E. M. HEITHMAR. Sampling and Analysis of Nanomaterials in the Environment: A State-of-Science Review. Presented at 42nd Western Regional Meeting American Chemical Society, Las Vegas, NY, September 23 - 27, 2008.
BRADFORD, D. F., E. M. HEITHMAR, N. G. TALLENT-HALSELL, G. MOMPLAISIR, C. G. ROSAL, K. E. VARNER, L. A. RIDDICK, AND M. S. NASH. Temporal Patterns of Airborne Pesticides in Alpine Lakes of the Sierra Nevada, California. Presented at Society for Environmental Toxicology and Chemistry, Tampa, FL, November 16 - 20, 2008.
VARNER, K. E., D. KOPSICK, J. BEARDEN, R. Mollica, K. Krueger, E. Wood, S. Bhatia, C. Ives, P. Barlett, N. Kerr, R. Brackmann, R. Babilonia, AND S. Reid. The Future of Hazardous Waste Tracking: Radio Frequency Identification (RFID). Presented at 2008 Science Forum, Washington, DC, May 20 - 22, 2008.
VARNER, K. E. Use of Radio Frequency Identification (RFID) for Tracking Hazardous Waste Shipments Across International Borders -Test/QA Plan. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-08/027, 2008.
2007
BRADFORD, D. F., E. M. HEITHMAR, L. MCCONNELL, G. MOMPLAISIR, L. A. RIDDICK, C. G. ROSAL, S. SIMONICH, D. SPARLING, K. STANLEY, N. G. TALLENT-HALSELL, AND K. E. VARNER. AIRBORNE PESTICIDES AND POPULATION DECLINES OF A CALIFORNIA ALPINE FROG. Presented at Environmental Biology Seminar, Las Vegas, NV, February 14, 2007.
VARNER, K. E., D. KOPSICK, AND J. BEARDEN. ETV/ESTE RADIO FREQUENCY IDENTIFICATION PROJECT. Presented at ETV/SBIR outreach Workshop Team Meeting, Dallas, TX, May 08 - 09, 2007.
BRADFORD, D. F., E. M. HEITHMAR, K. STANLEY, L. MCCONNELL, D. SPARLING, S. SIMONICH, N. G. TALLENT-HALSELL, G. MOMPLAISIR, C. G. ROSAL, L. A. RIDDICK, AND K. E. VARNER. TEMPORAL AND SPATIAL PATTERNS OF AIRBORNE PESTICIDES IN THE ALPINE ENVIRONMENT OF A DECLINING CALIFORNIA AMPHIBIAN, THE MOUNTAIN YELLOW-LEGGED FROG. Presented at Understanding Agriculture's Effects on Amphibians and Reptiles in a Changing World, St. Louis, MO, February 06 - 08, 2007.
BRADFORD, D. F., E. M. HEITHMAR, N. G. TALLENT-HALSELL, G. MOMPLAISIR, C. G. ROSAL, L. A. RIDDICK, AND K. E. VARNER. TEMPORAL PATTERNS OF AIRBORNE PESTICIDES IN THE HABITATE OF THE MOUNTAIN YELLOW-LEGGED FROG IN THE SOUTHERN SIERRA NEVADA. Presented at Annual Meeting of California-Nevada Amphibian Populations Task Force, Las Vegas, NV, January 18 - 20, 2007.
2006
BRADFORD, D. F., E. M. HEITHMAR, G. MOMPLAISIR, C. G. ROSAL, N. G. TALLENT-HALSELL, L. A. RIDDICK, AND K. E. VARNER. TEMPORAL VARIATION IN PESTICIDE LEVELS IN SURFACE WATERS OF THE SOUTHERN NEVADA, CALIFORNIA. Presented at Workshop: Knowledge, Uncertainties and Research Needs in Evaluationg the Role of Pesticides in Amphibian Population Declines in California and Globally, Society for Conservation Biology, San Jose, CA, June 24, 2006.
KOPSICK, D., J. BEARDEN, K. E. VARNER, AND JOHNG LYON. USE OF RFID TO TRACK HAZARDOUS WASTE SHIPMENTS ACORSS DOMESTIC AND INTERNATIONAL BORDERS. Presented at 2006 EPA Science Forum, Washington, DC, May 16 - 18, 2006.
VARNER, K. E., D. KOPSICK, AND J. BEARDEN. USE OF RFID TO TRACK HAZARDOUS WASTE SHIPMENTS ACROSS DOMESTIC AND INTERNATIONAL BORDERS. Presented at 2006 EPA Science Forum, Washington, DC, May 16 - 18, 2006.
VARNER, K. E. USE OF RFID TO TRACK HAZARDOUS WASTE SHIPMENTS ACROSS DOMESTIC AND INTERNATIONAL BORDERS. Presented at EPCglobal US Chemical Industry Summit, Houston, TX, June 21, 2006.
2004
JonesLepp, T, K E. Varner, AND D T. Heggem. MONITORING DIBUTYLTIN AND TRIPHENYLTIN IN FRESH WATERS AND FISH IN THE UNITED STATES USING MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY. ARCHIVES OF ENVIRONMENTAL CONTAMINATION & TOXICOLOGY 46(1):90-95, (2004).
2003
Rosal, C G., L A. Riddick, E M. Heithmar, G M. Momplaisir, K E. Varner, P. L. Ferguson, D F. Bradford, AND N G. TallentHalsell. ANALYSIS OF LOW-LEVEL PESTICIDES FROM HIGH-ELEVATION LAKE WATERS BY LARGE VOLUME INJECTION GCMS. Presented at Pittsburg Conference 2003, Orlando, FL, March 13, 2003.
Rosal, C G., L A. Riddick, E M. Heithmar, G M. Momplaisir, K E. Varner, P. L. Ferguson, D F. Bradford, AND N G. TallentHalsell. ANALYSIS OF LOW-LEVEL PESTICIDES FROM HIGH-ELEVATION LAKE WATERS BY LARGE-VOLUME INJECTION GCMS. Presented at Pittsburgh Confernece on Anlytical Chemistry and Applied Spectroscopy 2003, Orlando, FL, March 9-14, 2003.
Momplaisir, G M., K E. Varner, E M. Heithmar, C G. Rosal, L A. Riddick, P. L. Ferguson, B. Gentry, D F. Bradford, AND N G. TallentHalsell. DETERMINATION OF ULTRATRACE CONCENTRATIONS OF AGRICULTURAL PESTICIDES IN WATER USING SOLID-PHASE EXTRACTION AND ANALYSIS BY GC/MS. Presented at Pittsburgh Conference on Analytical Chemistry and Applied Spectrometry, Orlando, FL, March 9-14, 2003.
Rosal, C G., L A. Riddick, G M. Momplaisir, E M. Heithmar, AND K E. Varner. PULSED SPLITLESS AND LARGE-VOLUME INJECTION IN CAPILLARY GAS CHROMATOGRAPHY MASS SPECTROMETRY FOR THE DETERMINATION OF ULTRA-TRACE LEVEL PESTICIDE RESIDUES. Presented at National Environmental Monitoring Conference 2003, Arlington, VA, July 21-24, 2003.
Varner, K E., G M. Momplaisir, N G. TallentHalsell, D F. Bradford, P. L. Ferguson, L A. Riddick, C G. Rosal, AND E M. Heithmar. THE CHALLENGE OF ACQUIRING ALPINE LARGE VOLUME LAKE WATER SAMPLES FOR ULTRA TRACE LEVEL ANALYSIS. Presented at On-Site 11th International Conference, Phoenix, AZ, January 21-24, 2003.
2001
Bradford, D F., E M. Heithmar, C L. Cross, B. Gentry, G M. Momplaisir, M S. Nash, N G. TallentHalsell, L A. Riddick, C G. Rosal, AND K E. Varner. DISTRIBUTIONS OF AIRBORNE AGRICULTURAL CONTAMINANTS RELATIVE TO AMPHIBIAN POPULATIONS IN THE SOUTHERN SIERRA NEVADA, CA. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-01/085 (NTIS PB2002-102156), 2001.
JonesLepp, T AND K E. Varner. SPECIATION AND DETECTION OF ORGANOTINS FROM PVC PIPE BY MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY-ION TRAP MASS SPECTROMETRY. APPLIED ORGANOMETALLIC CHEMISTRY 15(12):933-938, (2001).
2000
JonesLepp, T, K E. Varner, AND A. Mitchell. DEVELOPMENT AND APPLICATION OF A SOLID PHASE EXTRACTION AND MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY METHOD FOR DETECTING THREE PHARAMACEUTICALS IN NATURAL WATERS. Presented at National Ground Water Association Emerging Issues Conference, Minneapolis, MN, June 7-8, 2000.
JonesLepp, T AND K E. Varner. MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY FOR DETECTION OF DIBUTYLTIN-IN NATURAL WATERS. Presented at ACS Special Symposium "Issues in the Analysis of Environmental Disruptors", San Francisco, CA, March 26-31, 2000.
JonesLepp, T AND K E. Varner. MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY/ION TRAP MASS SPECTROMETRY FOR DETECTION OF TWO SUSPECTED ENDOCRINE DISRUPTORS - DIBUTYLTIN AND TRIPHENYLTIN - IN NATURAL WATERS AND FISH TISSUE. Presented at ACS Special Symposium "Issues in the Analysis of Environmental Endocrine Disruptors", San Francisco, CA, March 26-31, 2000.
1999
JonesLepp, T, K E. Varner, M R. McDaniel, AND L A. Riddick. DETERMINATION OF ORGANOTINS IN WATER BY MICRO-LIQUID CHROMATOGRAPHY-ELECTROSPRAY ION TRAP MASS SPECTROMETRY. APPLIED ORGANOMETALLIC CHEMISTRY 13:881-889, (1999).
Varner, K E., T L. Jones, AND F. MonnetTschudi. DIBUTLYTIN MEASURED IN BRAIN TISSUE USING LIQUID CHROMATOGRAPHY ELECTROSPRAY/MASS SPECTROMETRY. Presented at ACS National Meeting, San Francisco, CA, March 26-31, 2000.
Varner, K E., T L. Jones, AND A. Mitchell. DIBUTYLTIN MEASURED IN BRAIN TISSUE LISTING U-LIQUID CHROMATOGRAPHY ELECTROSPRAY/MASS SPECTROMETRY. Presented at 1999 Pacific Conference on Chemistry and Spectroscopy/35th ACS Western Regional Meeting, Ontario, CA, October 6-8, 1999.
1998
Eskes, C., P. Honegger, F. MonnetTschudi, T JonesLepp, AND K E. Varner. NEUOROTOXICITY OF DIBUTYLTIN IN AGGREGATING BRAIN CELL CULTURE. Congress for INVITOX, England, September 1998.
1997
Kreamer, D. K., D. E. James, AND K E. Varner. DETERMINATION OF POLLUTANT DISTRIBUTION AND MOVEMENT BY CONTROLLED LABORATORY EXPERIMENTS. U.S. Environmental Protection Agency, Washington, DC, EPA/600/SR-97/004, 1997.
Jones, T L., K E. Varner, AND L A. Riddick. USING CE-ELECTROSPRAY-ION TRAP MASS SPECTROMETRY TO MEASURE ORGANOTINS IN AN AMBIENT ENVIRONMENT. Presented at 45th American Society for Mass Spectrometry and Allied Topics Conference, Palm Springs, CA, June 1-5, 1997.
Jones, T L., K E. Varner, AND L A. Riddick. USING U-LIQUID CHROMATOGRAPHY-ELECTROSPRAY-ION-TRAP MASS SPECTROMETRY TO MEASURE ORGANOTINS IN AN AMBIENT ENVIRONMENT. Presented at 45th American Society for Mass Spectrometry and Allied Topics Conference, Palm Springs, CA, June 1-5, 1997.
1996
Denne, J E., L A. Eccles, E J. Englund, S P. Gardner, A T. Mazzella, J M. Nocerino, C G. Rosal, B A. Schumacher, J J. van Ee, AND K E. Varner. RESEARCH AT THE U.S. EPA'S CHARACTERIZATION AND ASSESSMENT PROGRAM. Presented at Invited Presentation for the University of Nevada Water Resources 706 Class, Las Vegas, NV, November 13, 1996.
1995
Varner, K E. FIELD SCREENING METHODS FOR BTEX: CAN THEY WORK? Presented at Region 9's 'All States' Conference, September 14, 1995.


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